Yesterday I was really tired for some reason, and fell asleep around 3-4 hours before my normal bed time, so I wasn't really surprised when I woke up at 2 AM, and I decided to try to get into a dream. So I closed my eyes and got some HI fairly quickly, and this is where things get weird, after a little more time, I felt like my mattress had been lifted at my feet and my head was dipped down. Then my arms felt very twisted in impossible ways, but it didn't hurt, they just felt twisted. Also I began to experience a sensation as though my eyes were open, but i couldn't really tell, since my room was pitch black, and while it felt like my eyes were open, my HI became gray and more fluid,(its hard to describe it but here's my attempt) it looked like I was moving very quickly, there would be a circular pulse of gray that started from the center and moved to the edges of my vision. Eventually, I became very uncomfortable with my arms feeling twisted in impossible ways, so I got up for some water and rolled over to fall asleep normally.
Also, during the strange thing with my arms, I tried willing them to untwist, and it felt as though they did, not completely, but it was less unsettling, but when I took my focus off of untwisting them, they twisted back up.
So, I've been wondering, has anyone else has felt the arm twisting, or head dipping sensation?